Overview
Titanium Dioxide (TiO2) for White PC is a premium-grade pigment engineered specifically for polycarbonate (PC) applications. It is favored for its exceptional ability to impart whiteness, opacity, and UV protection without compromising the mechanical properties of PC. This makes it indispensable in industries requiring durable, high-performance plastics, such as automotive lighting, electronic enclosures, and construction materials. The compound is typically supplied in rutile form due to its higher refractive index and superior dispersibility in PC matrices. Manufacturers often apply surface treatments (e.g., silica or alumina coatings) to optimize compatibility with PC resins and prevent agglomeration during processing.
Physical and Chemical Properties
TiO2 for PC exhibits a high refractive index (2.7 for rutile), which maximizes light scattering and opacity even at low loading levels (typically 1–5% by weight). Its thermal stability (up to 1,800°C for rutile) ensures no degradation during PC injection molding or extrusion processes (commonly 280–320°C). The UV-absorbing properties of TiO2 protect PC from yellowing and embrittlement caused by prolonged sunlight exposure. Particle size is tightly controlled (usually 0.2–0.3 µm) to balance opacity and dispersion efficiency. Unlike anatase, rutile TiO2 has lower photocatalytic activity, reducing the risk of polymer degradation.
Main Applications
In the automotive sector, TiO2-enhanced PC is used for headlight lenses, interior trim, and sunroof panels due to its combination of clarity (when finely dispersed) and weatherability. Electronics manufacturers rely on it for LED diffusers, laptop housings, and smartphone cases where aesthetic appeal and durability are critical. Construction applications include translucent roofing sheets and noise barriers, where TiO2 provides long-term color retention. Specialty grades are also employed in medical device housings and food-contact PC containers, subject to regulatory approvals like FDA and EU 10/2011 compliance.
Safety and Storage
While TiO2 is generally considered low-toxicity, inhalation of powder during handling should be avoided. NIOSH recommends a respirable dust exposure limit of 2.4 mg/m³ (TiO2 as total dust). Facilities must use local exhaust ventilation and provide workers with N95 masks and protective eyewear. Storage requires moisture-proof packaging (often 25-kg multilayer bags with inner liners) in a dry warehouse below 30°C. Bulk shipments may use supersacks with desiccants. Contamination with organics or metals must be prevented to maintain polymer compatibility.
B2B Procurement Guide
When sourcing TiO2 for PC, prioritize suppliers with PC-specific formulations and batch-to-batch consistency testing. Key specifications to request include: rutile content (>95%), surface treatment type, median particle size (D50), and residue on 45µm sieve (<0.1%). Sample testing in your PC resin is essential to evaluate dispersion quality (via haze and yellowness index measurements). For large orders, negotiate pricing tiers and confirm lead times—global supply chains may face fluctuations due to raw material (ilmenite or chloride process) availability. Consider regional suppliers to reduce logistics costs for bulk shipments.
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